Random question about my goose Nada

[Deafnick]

Can you over feed a goose?
Is their stomach in their neck?
How much chick grit do I put out? Do I mix it with her food?
There are feathers on her back now is she 4 weeks yet? Trying to find her age to five her a “birthdate”. My nephew washes her to have one.
At the beginning of this post o thought I had a lot of them, If I have anymore I’ll put in the comments.

 

[The goose girl]

Goslings grow so fast, you can't overfeed them.
Their "stomach", the crop, is in their neck - you can actually see how full they are. Try googling bird digestive system.
Let her always have access to grit - she'll regulate herself. No reason to mix it in with her food.
In the pictures she looks 3-3,5 weeks old.